Integ,
The Witnesses "growth" doesn't surprise me at all.
The Mormon Church is growing by leaps and bounds -- why? We've seen a dramatic rise in the number of pseudoscientific beliefs like astrology and UFOs in the last 20 years -- why? One of the hottest series of books at any bookstore are the apocalyptic "Christian fiction" works by Tim LaHaye called "Left Behind" -- why? Because, to be blunt, people are all too eager to believe silly things.
If you want a really good book to read that will help explain the mass delusions like the JW phenomenon, take a look at Eric Hoffer's The True Believer. You will find that when a group faces persecution, dissappointment or scandel often they just get stronger and grow tighter.
Oh....think of the Catholic Church and all the *$&% they have had in their Church history. Yet, people still believe in them! Crazy, stupid and ridiculous.
Bradley